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Fibularis tertius

The fibularis tertius
muscle, also known as the peroneus
tertius, is located on the front of the lower leg. At the top it is
attached in the lower third of the fibula, one of the two bones of the lower
leg. The tendon at the lower end is attached to the metatarsal bone of the
fifth toe. Nervous system functions are supplied to this muscle by the deep
fibular nerve.

Its function is to move the toes toward the shin
(dorsiflexion), and to move the foot away from the middle plane of the body
(eversion).

Problems with this muscle can manifest as ankle and heel
pain. Massage therapy for the fibularis tertius muscle can provide relief, as
can hot or cold compresses. Non-steroidal anti-inflammatory drugs (NSAIDS) such
as Ibuprofen can reduce inflammation and provide pain relief. The fibularis
tertius may be used in reconstructive surgery to replace muscle tissue
elsewhere in the body.

The fibularis tertius muscle is rarely found in other
primates. It is thought that its development played a role in the evolution of
bipedalism (walking on two limbs).